A monkey-patch for debugging mongo criteria thingies

monkey_patch.rb

class String
  def fix(size, padstr=' ')
    self[0...size].ljust(size, padstr)
  end
end

class Mongoid::Criteria
  # pull values out into easy-to-read columns
  def interrogate(*syms)
    syms = [:id,:created_at,:updated_at] if syms.empty?
    puts syms.map{|sym| [sym] + self.map(&sym) }.transpose.map{|l| l.map{|l|l.to_s.fix(25)}.join("\t")}
  end
  # when you just want to #find on something that isn't an id
  def just_one(args)
    criteria = self.where(args)
    case criteria.count
    when 0
      raise 'not found'
    when 1
      criteria.first
    else
      raise 'multiple found'
    end
  end
end